The history of statistical hypothesis testing really began with a tea-tasting experiment (Fisher, 1935), so it seems fitting for this book to end with one. The owner of a small tearoom does not think...

The history of statistical hypothesis testing really began with a tea-tasting experiment (Fisher, 1935), so it seems fitting for this book to end with one. The owner of a small tearoom does not think that people really can tell the difference between the first cup made with a given tea bag and the second and third cups made with the same bag (perhaps that is why it is still a small tearoom). He chooses eight different brands of tea bags, makes three cups of tea with each, reusing the same tea bag, and then has a group of customers rate each cup on a 20-point scale (without knowing which cup is which). The data are shown here, with higher ratings indicating better tea.